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AFS Securities (Amortized cost and fair value of AFS securities by contractual maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less $ 13,548  
Maturing, After One Year But Within Five Years 263,615  
Maturing, After Five Years But Within Ten Years 29,106  
Maturing, After Ten Years 32,533  
Securities With Variable Monthly Payments or Noncontractual Maturities 235,914  
Amortized Cost 574,716 $ 625,605
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less, Fair value 13,513  
Maturing, After One Year But Within Five Years, Fair value 241,669  
Maturing, After Five Years But Within Ten Years, Fair value 26,959  
Maturing, After Ten Years, Fair value 29,191  
Securities With Variable Monthly Payments or Noncontractual Maturities, Fair value 219,165  
Total, Fair value 530,497 580,481
States and political subdivisions [Member]    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 13,548  
Maturing, After One Year But Within Five Years 32,194  
Maturing, After Five Years But Within Ten Years 20,956  
Maturing, After Ten Years 32,533  
Securities With Variable Monthly Payments or Noncontractual Maturities 0  
Amortized Cost 99,231 122,023
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 95,242 117,512
Auction rate money market preferred [Member]    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 0  
Maturing, After One Year But Within Five Years 0  
Maturing, After Five Years But Within Ten Years 0  
Maturing, After Ten Years 0  
Securities With Variable Monthly Payments or Noncontractual Maturities 3,200  
Amortized Cost 3,200 3,200
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 2,637 2,342
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 0  
Maturing, After One Year But Within Five Years 0  
Maturing, After Five Years But Within Ten Years 0  
Maturing, After Ten Years 0  
Securities With Variable Monthly Payments or Noncontractual Maturities 38,731  
Amortized Cost 38,731 42,309
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 35,532 39,070
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 0  
Maturing, After One Year But Within Five Years 0  
Maturing, After Five Years But Within Ten Years 0  
Maturing, After Ten Years 0  
Securities With Variable Monthly Payments or Noncontractual Maturities 193,983  
Amortized Cost 193,983 218,301
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 180,996 205,728
Corporate Debt Securities    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 0  
Maturing, After One Year But Within Five Years 0  
Maturing, After Five Years But Within Ten Years 8,150  
Maturing, After Ten Years 0  
Securities With Variable Monthly Payments or Noncontractual Maturities 0  
Amortized Cost 8,150 8,150
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value 6,737 7,128
US Treasury Securities    
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Maturing, Due in One Year or Less 0  
Maturing, After One Year But Within Five Years 231,421  
Maturing, After Five Years But Within Ten Years 0  
Maturing, After Ten Years 0  
Securities With Variable Monthly Payments or Noncontractual Maturities 0  
Amortized Cost 231,421 231,622
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Total, Fair value $ 209,353 $ 208,701